h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

There is a theory amoung amateur professionals -- in otherwords, I heard it somewhere but don't remember where -- that the uncomfortable feeling you get when someone scrapes a chalkboard has its origin in the evolution of the human species.

Supposedly, the roar of a primitive predator -- a primitive-man-eating sabre-tooth tiger, perhaps -- which is similar to the chalkboard sound begins causing the eebie-jeebies in primitive man when natural selection finds those who have the newly emerging squeemishness gene to be more likely to flee -- successfully -- from the jaws of the hungry predator.

What do you think? Boring Fact or Interesting Fiction?

It´s the biggest load of garbage I have ever read! How the world did you come up with something like that? The worst of it is, you might be right for all I know!
I just joined this community, and I´m impressed over all you lunatics! I´m completely sane, of course. The fact that I have been abducted by aliens several times, hasn´t affected my sanity one bit!